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struct flexArrayStruct {
  int num;
  int data[1];
};

/* ... */

size_t array_size;
size_t i;

/* initialize array_size */

/* space is allocated for the struct */
struct flexArrayStruct *structP 
  = (struct flexArrayStruct *) 
     malloc(sizeof(struct flexArrayStruct) 
          + sizeof(int) * (array_size - 1));
if (structP == NULL) {
  /* handle malloc failure */
}
structP->num = 0;

/* access data[] as if it had been allocated
 * as data[array_size] */
for (i = 0; i < array_size; i++) {
  structP->data[i] = 1;
}

struct flexArrayStruct{
  int num;
  int data[];
};

/* ... */

size_t array_size;
size_t i;

/* initialize array_size */

/* Space is allocated for the struct */
struct flexArrayStruct *structP 
  = (struct flexArrayStruct *)
     malloc(sizeof(struct flexArrayStruct) 
          + sizeof(int) * array_size);
if (structP == NULL) {
  /* handle malloc failure */
}

structP->num = 0;

/* Access data[] as if it had been allocated 
 * as data[array_size] */
for (i = 0; i < array_size; i++) {
  structP->data[i] = 1;
}